import { type Type } from '@frontmcp/di';
import { type LogLevel } from '../types';
export interface LogRecord {
    level: LogLevel;
    levelName: string;
    message: string;
    args: unknown[];
    timestamp: Date;
    prefix: string;
}
export type LogFn = (msg?: any, ...args: any[]) => void;
export declare abstract class LogTransportInterface {
    abstract log(rec: LogRecord): void;
}
export type LogTransportType<T = any> = Type<T>;
export declare abstract class FrontMcpLogger {
    abstract child(prefix: string): FrontMcpLogger;
    /**
     * Verbose — extremely granular, high-volume logs useful when diagnosing tricky bugs
     * (function entry/exit, detailed branches, low-level I/O). Disable in most environments.
     */
    abstract get verbose(): (...args: any[]) => void;
    /**
     * Debug — development-focused diagnostics (state changes, computed values, API request params),
     * still fairly verbose but less noisy than TRACE. Typically disabled in production.
     */
    abstract get debug(): (...args: any[]) => void;
    /**
     * Info — key milestones in normal operation (server start, feature toggles, user actions,
     * successful requests). Safe to keep enabled in production.
     */
    abstract get info(): (...args: any[]) => void;
    /**
     * Warn — unexpected or suboptimal situations that the system handled and continued
     * (fallbacks, retries, partial failures). Worth investigating but not service-breaking.
     */
    abstract get warn(): (...args: any[]) => void;
    /**
     * Error — failures where an operation could not complete or data is invalid,
     */
    abstract get error(): (...args: any[]) => void;
}
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